Answer:
89 mm
Explanation:
Use the pythagorean therom to solve for the hypotenuse which is (c).
Ex: a^2+b^3=c^2
Subsitute
80^2+39^2=c^2
6400+1521=c^2
6400+1521=c^2
Add
6400+1521=7921
Now you have the following equation...
7921=c^2
Sqaure both sides of the equation
sqrt7921=sqrtc^2
89=c
So C=89 mm there you go :)
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